from pytest import mark
from twisted.trial import unittest

from scrapy.http import Response, TextResponse, XmlResponse
from scrapy.utils.iterators import _body_or_str, csviter, xmliter, xmliter_lxml
from tests import get_testdata


class XmliterTestCase(unittest.TestCase):
    xmliter = staticmethod(xmliter)

    def test_xmliter(self):
        body = b"""
            <?xml version="1.0" encoding="UTF-8"?>
            <products xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                      xsi:noNamespaceSchemaLocation="someschmea.xsd">
              <product id="001">
                <type>Type 1</type>
                <name>Name 1</name>
              </product>
              <product id="002">
                <type>Type 2</type>
                <name>Name 2</name>
              </product>
            </products>
        """

        response = XmlResponse(url="http://example.com", body=body)
        attrs = []
        for x in self.xmliter(response, "product"):
            attrs.append(
                (
                    x.attrib["id"],
                    x.xpath("name/text()").getall(),
                    x.xpath("./type/text()").getall(),
                )
            )

        self.assertEqual(
            attrs, [("001", ["Name 1"], ["Type 1"]), ("002", ["Name 2"], ["Type 2"])]
        )

    def test_xmliter_unusual_node(self):
        body = b"""<?xml version="1.0" encoding="UTF-8"?>
            <root>
                <matchme...></matchme...>
                <matchmenot></matchmenot>
            </root>
        """
        response = XmlResponse(url="http://example.com", body=body)
        nodenames = [
            e.xpath("name()").getall() for e in self.xmliter(response, "matchme...")
        ]
        self.assertEqual(nodenames, [["matchme..."]])

    def test_xmliter_unicode(self):
        # example taken from https://github.com/scrapy/scrapy/issues/1665
        body = """<?xml version="1.0" encoding="UTF-8"?>
            <þingflokkar>
               <þingflokkur id="26">
                  <heiti />
                  <skammstafanir>
                     <stuttskammstöfun>-</stuttskammstöfun>
                     <löngskammstöfun />
                  </skammstafanir>
                  <tímabil>
                     <fyrstaþing>80</fyrstaþing>
                  </tímabil>
               </þingflokkur>
               <þingflokkur id="21">
                  <heiti>Alþýðubandalag</heiti>
                  <skammstafanir>
                     <stuttskammstöfun>Ab</stuttskammstöfun>
                     <löngskammstöfun>Alþb.</löngskammstöfun>
                  </skammstafanir>
                  <tímabil>
                     <fyrstaþing>76</fyrstaþing>
                     <síðastaþing>123</síðastaþing>
                  </tímabil>
               </þingflokkur>
               <þingflokkur id="27">
                  <heiti>Alþýðuflokkur</heiti>
                  <skammstafanir>
                     <stuttskammstöfun>A</stuttskammstöfun>
                     <löngskammstöfun>Alþfl.</löngskammstöfun>
                  </skammstafanir>
                  <tímabil>
                     <fyrstaþing>27</fyrstaþing>
                     <síðastaþing>120</síðastaþing>
                  </tímabil>
               </þingflokkur>
            </þingflokkar>"""

        for r in (
            # with bytes
            XmlResponse(url="http://example.com", body=body.encode("utf-8")),
            # Unicode body needs encoding information
            XmlResponse(url="http://example.com", body=body, encoding="utf-8"),
        ):
            attrs = []
            for x in self.xmliter(r, "þingflokkur"):
                attrs.append(
                    (
                        x.attrib["id"],
                        x.xpath("./skammstafanir/stuttskammstöfun/text()").getall(),
                        x.xpath("./tímabil/fyrstaþing/text()").getall(),
                    )
                )

            self.assertEqual(
                attrs,
                [("26", ["-"], ["80"]), ("21", ["Ab"], ["76"]), ("27", ["A"], ["27"])],
            )

    def test_xmliter_text(self):
        body = (
            '<?xml version="1.0" encoding="UTF-8"?>'
            "<products><product>one</product><product>two</product></products>"
        )

        self.assertEqual(
            [x.xpath("text()").getall() for x in self.xmliter(body, "product")],
            [["one"], ["two"]],
        )

    def test_xmliter_namespaces(self):
        body = b"""
            <?xml version="1.0" encoding="UTF-8"?>
            <rss version="2.0" xmlns:g="http://base.google.com/ns/1.0">
                <channel>
                <title>My Dummy Company</title>
                <link>http://www.mydummycompany.com</link>
                <description>This is a dummy company. We do nothing.</description>
                <item>
                    <title>Item 1</title>
                    <description>This is item 1</description>
                    <link>http://www.mydummycompany.com/items/1</link>
                    <g:image_link>http://www.mydummycompany.com/images/item1.jpg</g:image_link>
                    <g:id>ITEM_1</g:id>
                    <g:price>400</g:price>
                </item>
                </channel>
            </rss>
        """
        response = XmlResponse(url="http://mydummycompany.com", body=body)
        my_iter = self.xmliter(response, "item")
        node = next(my_iter)
        node.register_namespace("g", "http://base.google.com/ns/1.0")
        self.assertEqual(node.xpath("title/text()").getall(), ["Item 1"])
        self.assertEqual(node.xpath("description/text()").getall(), ["This is item 1"])
        self.assertEqual(
            node.xpath("link/text()").getall(),
            ["http://www.mydummycompany.com/items/1"],
        )
        self.assertEqual(
            node.xpath("g:image_link/text()").getall(),
            ["http://www.mydummycompany.com/images/item1.jpg"],
        )
        self.assertEqual(node.xpath("g:id/text()").getall(), ["ITEM_1"])
        self.assertEqual(node.xpath("g:price/text()").getall(), ["400"])
        self.assertEqual(node.xpath("image_link/text()").getall(), [])
        self.assertEqual(node.xpath("id/text()").getall(), [])
        self.assertEqual(node.xpath("price/text()").getall(), [])

    def test_xmliter_namespaced_nodename(self):
        body = b"""
            <?xml version="1.0" encoding="UTF-8"?>
            <rss version="2.0" xmlns:g="http://base.google.com/ns/1.0">
                <channel>
                <title>My Dummy Company</title>
                <link>http://www.mydummycompany.com</link>
                <description>This is a dummy company. We do nothing.</description>
                <item>
                    <title>Item 1</title>
                    <description>This is item 1</description>
                    <link>http://www.mydummycompany.com/items/1</link>
                    <g:image_link>http://www.mydummycompany.com/images/item1.jpg</g:image_link>
                    <g:id>ITEM_1</g:id>
                    <g:price>400</g:price>
                </item>
                </channel>
            </rss>
        """
        response = XmlResponse(url="http://mydummycompany.com", body=body)
        my_iter = self.xmliter(response, "g:image_link")
        node = next(my_iter)
        node.register_namespace("g", "http://base.google.com/ns/1.0")
        self.assertEqual(
            node.xpath("text()").extract(),
            ["http://www.mydummycompany.com/images/item1.jpg"],
        )

    def test_xmliter_namespaced_nodename_missing(self):
        body = b"""
            <?xml version="1.0" encoding="UTF-8"?>
            <rss version="2.0" xmlns:g="http://base.google.com/ns/1.0">
                <channel>
                <title>My Dummy Company</title>
                <link>http://www.mydummycompany.com</link>
                <description>This is a dummy company. We do nothing.</description>
                <item>
                    <title>Item 1</title>
                    <description>This is item 1</description>
                    <link>http://www.mydummycompany.com/items/1</link>
                    <g:image_link>http://www.mydummycompany.com/images/item1.jpg</g:image_link>
                    <g:id>ITEM_1</g:id>
                    <g:price>400</g:price>
                </item>
                </channel>
            </rss>
        """
        response = XmlResponse(url="http://mydummycompany.com", body=body)
        my_iter = self.xmliter(response, "g:link_image")
        with self.assertRaises(StopIteration):
            next(my_iter)

    def test_xmliter_exception(self):
        body = (
            '<?xml version="1.0" encoding="UTF-8"?>'
            "<products><product>one</product><product>two</product></products>"
        )

        iter = self.xmliter(body, "product")
        next(iter)
        next(iter)

        self.assertRaises(StopIteration, next, iter)

    def test_xmliter_objtype_exception(self):
        i = self.xmliter(42, "product")
        self.assertRaises(TypeError, next, i)

    def test_xmliter_encoding(self):
        body = (
            b'<?xml version="1.0" encoding="ISO-8859-9"?>\n'
            b"<xml>\n"
            b"    <item>Some Turkish Characters \xd6\xc7\xde\xdd\xd0\xdc \xfc\xf0\xfd\xfe\xe7\xf6</item>\n"
            b"</xml>\n\n"
        )
        response = XmlResponse("http://www.example.com", body=body)
        self.assertEqual(
            next(self.xmliter(response, "item")).get(),
            "<item>Some Turkish Characters \xd6\xc7\u015e\u0130\u011e\xdc \xfc\u011f\u0131\u015f\xe7\xf6</item>",
        )


class LxmlXmliterTestCase(XmliterTestCase):
    xmliter = staticmethod(xmliter_lxml)

    @mark.xfail(reason="known bug of the current implementation")
    def test_xmliter_namespaced_nodename(self):
        super().test_xmliter_namespaced_nodename()

    def test_xmliter_iterate_namespace(self):
        body = b"""
            <?xml version="1.0" encoding="UTF-8"?>
            <rss version="2.0" xmlns="http://base.google.com/ns/1.0">
                <channel>
                <title>My Dummy Company</title>
                <link>http://www.mydummycompany.com</link>
                <description>This is a dummy company. We do nothing.</description>
                <item>
                    <title>Item 1</title>
                    <description>This is item 1</description>
                    <link>http://www.mydummycompany.com/items/1</link>
                    <image_link>http://www.mydummycompany.com/images/item1.jpg</image_link>
                    <image_link>http://www.mydummycompany.com/images/item2.jpg</image_link>
                </item>
                </channel>
            </rss>
        """
        response = XmlResponse(url="http://mydummycompany.com", body=body)

        no_namespace_iter = self.xmliter(response, "image_link")
        self.assertEqual(len(list(no_namespace_iter)), 0)

        namespace_iter = self.xmliter(
            response, "image_link", "http://base.google.com/ns/1.0"
        )
        node = next(namespace_iter)
        self.assertEqual(
            node.xpath("text()").getall(),
            ["http://www.mydummycompany.com/images/item1.jpg"],
        )
        node = next(namespace_iter)
        self.assertEqual(
            node.xpath("text()").getall(),
            ["http://www.mydummycompany.com/images/item2.jpg"],
        )

    def test_xmliter_namespaces_prefix(self):
        body = b"""
        <?xml version="1.0" encoding="UTF-8"?>
        <root>
            <h:table xmlns:h="http://www.w3.org/TR/html4/">
              <h:tr>
                <h:td>Apples</h:td>
                <h:td>Bananas</h:td>
              </h:tr>
            </h:table>

            <f:table xmlns:f="http://www.w3schools.com/furniture">
              <f:name>African Coffee Table</f:name>
              <f:width>80</f:width>
              <f:length>120</f:length>
            </f:table>

        </root>
        """
        response = XmlResponse(url="http://mydummycompany.com", body=body)
        my_iter = self.xmliter(response, "table", "http://www.w3.org/TR/html4/", "h")

        node = next(my_iter)
        self.assertEqual(len(node.xpath("h:tr/h:td").getall()), 2)
        self.assertEqual(node.xpath("h:tr/h:td[1]/text()").getall(), ["Apples"])
        self.assertEqual(node.xpath("h:tr/h:td[2]/text()").getall(), ["Bananas"])

        my_iter = self.xmliter(
            response, "table", "http://www.w3schools.com/furniture", "f"
        )

        node = next(my_iter)
        self.assertEqual(node.xpath("f:name/text()").getall(), ["African Coffee Table"])

    def test_xmliter_objtype_exception(self):
        i = self.xmliter(42, "product")
        self.assertRaises(TypeError, next, i)


class UtilsCsvTestCase(unittest.TestCase):
    def test_csviter_defaults(self):
        body = get_testdata("feeds", "feed-sample3.csv")
        response = TextResponse(url="http://example.com/", body=body)
        csv = csviter(response)

        result = [row for row in csv]
        self.assertEqual(
            result,
            [
                {"id": "1", "name": "alpha", "value": "foobar"},
                {"id": "2", "name": "unicode", "value": "\xfan\xedc\xf3d\xe9\u203d"},
                {"id": "3", "name": "multi", "value": "foo\nbar"},
                {"id": "4", "name": "empty", "value": ""},
            ],
        )

        # explicit type check cuz' we no like stinkin' autocasting! yarrr
        for result_row in result:
            self.assertTrue(all(isinstance(k, str) for k in result_row.keys()))
            self.assertTrue(all(isinstance(v, str) for v in result_row.values()))

    def test_csviter_delimiter(self):
        body = get_testdata("feeds", "feed-sample3.csv").replace(b",", b"\t")
        response = TextResponse(url="http://example.com/", body=body)
        csv = csviter(response, delimiter="\t")

        self.assertEqual(
            [row for row in csv],
            [
                {"id": "1", "name": "alpha", "value": "foobar"},
                {"id": "2", "name": "unicode", "value": "\xfan\xedc\xf3d\xe9\u203d"},
                {"id": "3", "name": "multi", "value": "foo\nbar"},
                {"id": "4", "name": "empty", "value": ""},
            ],
        )

    def test_csviter_quotechar(self):
        body1 = get_testdata("feeds", "feed-sample6.csv")
        body2 = get_testdata("feeds", "feed-sample6.csv").replace(b",", b"|")

        response1 = TextResponse(url="http://example.com/", body=body1)
        csv1 = csviter(response1, quotechar="'")

        self.assertEqual(
            [row for row in csv1],
            [
                {"id": "1", "name": "alpha", "value": "foobar"},
                {"id": "2", "name": "unicode", "value": "\xfan\xedc\xf3d\xe9\u203d"},
                {"id": "3", "name": "multi", "value": "foo\nbar"},
                {"id": "4", "name": "empty", "value": ""},
            ],
        )

        response2 = TextResponse(url="http://example.com/", body=body2)
        csv2 = csviter(response2, delimiter="|", quotechar="'")

        self.assertEqual(
            [row for row in csv2],
            [
                {"id": "1", "name": "alpha", "value": "foobar"},
                {"id": "2", "name": "unicode", "value": "\xfan\xedc\xf3d\xe9\u203d"},
                {"id": "3", "name": "multi", "value": "foo\nbar"},
                {"id": "4", "name": "empty", "value": ""},
            ],
        )

    def test_csviter_wrong_quotechar(self):
        body = get_testdata("feeds", "feed-sample6.csv")
        response = TextResponse(url="http://example.com/", body=body)
        csv = csviter(response)

        self.assertEqual(
            [row for row in csv],
            [
                {"'id'": "1", "'name'": "'alpha'", "'value'": "'foobar'"},
                {
                    "'id'": "2",
                    "'name'": "'unicode'",
                    "'value'": "'\xfan\xedc\xf3d\xe9\u203d'",
                },
                {"'id'": "'3'", "'name'": "'multi'", "'value'": "'foo"},
                {"'id'": "4", "'name'": "'empty'", "'value'": ""},
            ],
        )

    def test_csviter_delimiter_binary_response_assume_utf8_encoding(self):
        body = get_testdata("feeds", "feed-sample3.csv").replace(b",", b"\t")
        response = Response(url="http://example.com/", body=body)
        csv = csviter(response, delimiter="\t")

        self.assertEqual(
            [row for row in csv],
            [
                {"id": "1", "name": "alpha", "value": "foobar"},
                {"id": "2", "name": "unicode", "value": "\xfan\xedc\xf3d\xe9\u203d"},
                {"id": "3", "name": "multi", "value": "foo\nbar"},
                {"id": "4", "name": "empty", "value": ""},
            ],
        )

    def test_csviter_headers(self):
        sample = get_testdata("feeds", "feed-sample3.csv").splitlines()
        headers, body = sample[0].split(b","), b"\n".join(sample[1:])

        response = TextResponse(url="http://example.com/", body=body)
        csv = csviter(response, headers=[h.decode("utf-8") for h in headers])

        self.assertEqual(
            [row for row in csv],
            [
                {"id": "1", "name": "alpha", "value": "foobar"},
                {"id": "2", "name": "unicode", "value": "\xfan\xedc\xf3d\xe9\u203d"},
                {"id": "3", "name": "multi", "value": "foo\nbar"},
                {"id": "4", "name": "empty", "value": ""},
            ],
        )

    def test_csviter_falserow(self):
        body = get_testdata("feeds", "feed-sample3.csv")
        body = b"\n".join((body, b"a,b", b"a,b,c,d"))

        response = TextResponse(url="http://example.com/", body=body)
        csv = csviter(response)

        self.assertEqual(
            [row for row in csv],
            [
                {"id": "1", "name": "alpha", "value": "foobar"},
                {"id": "2", "name": "unicode", "value": "\xfan\xedc\xf3d\xe9\u203d"},
                {"id": "3", "name": "multi", "value": "foo\nbar"},
                {"id": "4", "name": "empty", "value": ""},
            ],
        )

    def test_csviter_exception(self):
        body = get_testdata("feeds", "feed-sample3.csv")

        response = TextResponse(url="http://example.com/", body=body)
        iter = csviter(response)
        next(iter)
        next(iter)
        next(iter)
        next(iter)

        self.assertRaises(StopIteration, next, iter)

    def test_csviter_encoding(self):
        body1 = get_testdata("feeds", "feed-sample4.csv")
        body2 = get_testdata("feeds", "feed-sample5.csv")

        response = TextResponse(
            url="http://example.com/", body=body1, encoding="latin1"
        )
        csv = csviter(response)
        self.assertEqual(
            list(csv),
            [
                {"id": "1", "name": "latin1", "value": "test"},
                {"id": "2", "name": "something", "value": "\xf1\xe1\xe9\xf3"},
            ],
        )

        response = TextResponse(url="http://example.com/", body=body2, encoding="cp852")
        csv = csviter(response)
        self.assertEqual(
            list(csv),
            [
                {"id": "1", "name": "cp852", "value": "test"},
                {
                    "id": "2",
                    "name": "something",
                    "value": "\u255a\u2569\u2569\u2569\u2550\u2550\u2557",
                },
            ],
        )


class TestHelper(unittest.TestCase):
    bbody = b"utf8-body"
    ubody = bbody.decode("utf8")
    txtresponse = TextResponse(url="http://example.org/", body=bbody, encoding="utf-8")
    response = Response(url="http://example.org/", body=bbody)

    def test_body_or_str(self):
        for obj in (self.bbody, self.ubody, self.txtresponse, self.response):
            r1 = _body_or_str(obj)
            self._assert_type_and_value(r1, self.ubody, obj)
            r2 = _body_or_str(obj, unicode=True)
            self._assert_type_and_value(r2, self.ubody, obj)
            r3 = _body_or_str(obj, unicode=False)
            self._assert_type_and_value(r3, self.bbody, obj)
            self.assertTrue(type(r1) is type(r2))
            self.assertTrue(type(r1) is not type(r3))

    def _assert_type_and_value(self, a, b, obj):
        self.assertTrue(
            type(a) is type(b), f"Got {type(a)}, expected {type(b)} for { obj!r}"
        )
        self.assertEqual(a, b)
